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This article induces the key points and test principles of the developed the digital carpet electrostatic tester, which is used to measure the electrostatic charge amount generated by the friction between the shoes and the carpet when people walking on the carpet. The design of the hand-held electrode is based on the principle of capacitor divider. The paper proposed a static calibration based on...
The emergence of low-cost 3D printing has catalyzed many new applications in academic, industrial, military, and medical fields. 3D printing has been dubbed a very slow process because its most common underlying printing method, Fused Deposition Modeling (FDM), is time-consuming due to the limited speed of the extruder. Multiple extruders, working simultaneously, can accelerate the printing process,...
Dual-band WiFi which supports both 2.4GHz and 5GHz has been widely deployed, aiming to expand wireless capacity and eliminate serious interference in 2.4GHz. Thus, how to select which band to access to achieve considerable user experience is becoming essential in wireless network. Clients' native decision that always prefers 5GHz will consequently cause serious interference in 5GHz and leave 2.4GHz...
A free-fall vertical profiler developed by Ocean University of China had been deployed in the South China Sea with the descend speed of 0.35–0.4 m/s. Both of the fast-response thermistor and shear probes are attached to the turbulence observation instrument, which are used to estimate the turbulence intensity. Throughout the observation period, the profiler succeed to collect time series of turbulence...
Syslogs on switches are a rich source of information for both post-mortem diagnosis and proactive prediction of switch failures in a datacenter network. However, such information can be effectively extracted only through proper processing of syslogs, e.g., using suitable machine learning techniques. A common approach to syslog processing is to extract (i.e., build) templates from historical syslog...
The drag-type vertical axis wind turbines (VAWTs) have advantages of simple structure, self-starting at low wind speed and low cost, but they show low wind energy conversion efficiencies. A novel vertical axis wind turbine is proposed aiming to improve the disadvantage of the traditional wind turbines based on bionic principle in this paper. The structure of the novel vertical axis wind rotor is designed...
The deployment of the large-scale video analysis center that provides comprehensive video applications is the developing trend of video surveillance systems. It integrates intelligent video information analysis, the mass video image content retrieval, and the associated data mining of structural video data. In this paper, we present the hierarchical architecture of the video analysis center by discussing...
Traditional Savonius wind turbine has advantages such as simple structure, fast start-up, etc., however, it also has significant disadvantages of low wind energy utilization efficiency. A novel wind turbine is proposed by improving structure of Savonius wind turbine in order to increase the low wind energy utilization efficiency. To compare performance of the novel wind turbine and the Savonius wind...
This paper deals with model checking problems with respect to LTL properties under fairness assumptions. We first present an efficient algorithm to deal with a fragment of fairness assumptions and then extend the algorithm to handle arbitrary ones. Notably, by making use of some syntactic transformations, our algorithm avoids constructing corresponding Büchi automata for the whole fairness assumptions,...
This paper presents the design, fabrication, and testing of a novel 3D-printed triboelectric generator. By adopting the saw-toothed button structure, the friction surface at the interface is enlarged and enclosed, which helps to increase power generation capability and shrink device volume. The major parts of the proposed device is fabricated through 3D-printing, and the entire device is assembled...
Extensive and much attention have been injected to Terahertz (THZ) technologies in recent years due to its potential application in remote sensing, biomedical, and space communication. Compare with others, FET based THZ devices have a lot of advantages such as frequency tunable, structure compact and room temperature workable. The work in the ULTRA group explored the field effect transistor-based...
In this paper, we study the security performance with antenna selection in full-duplex system, where the destination is equiped with mutil-antennas. In our proposed scheme, the destination can combine a subset of “strongest” paths out of available paths from the source, and the others can sends jamming to the eavesdropper. We obtain the closed form expressions of security outage probability. Combining...
In this paper, the thought of space division full duplex (SDFD) is introduced to improve the flexibility of traffic adaptation in time division duplex (TDD) systems. In SDFD scheme, two spatial separated transmission points (TPs), which can be two base stations (BSs), serve downlink (DL) and uplink (UL), respectively. In this case, the interference between two TPs cannot be avoided, which might affect...
Abstract - The Internet of Things (IoT) is transforming industries and our daily lives. Industries are utilizing wide-area commercial Long-Term Evolution (LTE) networks to serve immediate and urgent IoT applications today. LTE was designed, however, for broadband service, while IoT is traditionally dominated by low-rate, low-power, and infrequent short-burst data. It is crucial to differentiate the...
This paper investigates a multi-objective path relinking algorithm in order to optimize a bi-objective unconstrained binary quadratic programming problem. In this algorithm, we integrate the path relinking techniques into hypervolume-based multi-objective optimization, where we propose a method to generate a path and select a set of non-dominated solutions from the generated path for further improvements...
The weapons and equipment are demanded to have strong maneuverability on the modern battlefield. The braking distance of the linear motor for electromagnetic launcher should be short to meet the launching demand. For now, the majority of brake methods are time consuming, and braking distances are long. Under the circumstances, a linear permanent magnet motor short distance blend brake system for electromagnetic...
Novel input-parallel output-parallel (IPOP) DC-DC converter with maximum power point tracking (MPPT) technique is presented in this paper, which consists of two cascaded stages including buck-boost and isolated boost, so as to achieve high voltage gain and galvanic isolation at proper duty ratio and low leakage energy. Using proposed DC-DC converter, multiple distributed generators (DGs) can be connected...
Radio-map based method has been widely used for indoor location and navigation, but remaining key challenges are: 1) laborious efforts to calibrate a fine-grained radio-map, and 2) the locating result inaccuracy and not robust problems due to random signal strength (RSS) noises. An efficient way to overcome these problems is to collect RSS signatures along indoor paths and utilize sequence matching...
Binary proximity sensors (BPS) is a generic model for many non- collaborative, presence detecting sensor. It outputs ``1'' when one or more targets are presenting in its sensing range and ``0" otherwise. It cannot tell the number of targets nor the targets' identities in its sensing range. But for its privacy protection and device-free properties, BPS-based tracking has attracted great attentions...
In-band full-duplex, allowing simultaneous transmission and reception on the same device over the same frequency, can double the spectral efficiency theoretically. However, the severe self-interference challenges the physical layer design. Thus, to simplify the interference cancellation (IC), the space division full-duplex (SDFD) is considered, where two spatial-separated transmission points (TPs),...
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